It shows that in the fourth quarter of 2012, 81% of U.S. workers either started a 401(k) plan or bulked up their contributions (what survey researchers describe as "positive" action.) Only 19% of employees took what the survey describes as negative actions, including taking a loan out from their 401(k) or decreasing plan contributions .

In fact, the study points out that 401(k) loans declined by 5% in the quarter, suggesting that Americans are more financially stable than in 2008 and 2009, the heart of the Great Recession.

A big part of that generally positive trend is the help employees are getting from employers, who are doing a better job of promoting 401(k) plans to employees. To keep momentum rolling, the Bank of America study says companies need to do even more to get employees involved in their retirement plans.

"HR professionals and financial services providers must continue to work together to protect and improve our retirement system by taking every step possible to help employees start early and continue on a path toward financial wellness," says Kevin Crain, head of institutional retirement and benefits services at Bank of America Merrill Lynch. "By empowering them to get the most out of their plans, employees can take greater control of their financial future."

Automatic enrollment plans are helping. The study says 52% of companies offering 401(k) automatic enrollment now also offer automatic plan increases. Year-to-year, company usage of automatic increases are up 17%.

In addition, companies are calling in employees for meetings on retirement planning more often. The Bank of America report says 30% more companies were hosting such meetings over the past year compared with 2011, and that employee attendance was up 22%.

"While it can be difficult for employees to improve their retirement saving and investing behaviors, employers can play an important role in fostering an environment that aids such positive change," explains Michael Liersch, director of behavioral finance for Bank of America Merrill Lynch. "Through targeted communications and allowing them time, when possible, to attend face-to-face meetings and receive financial advice at work, companies can help employees achieve more successful outcomes and improve their long-term financial security."